It should be long enough. Some short thigh high socks(knee high) are just over the knee, they do not have the possibility of becoming longer. Extra long thigh high socks easy to exceed the middle of the thigh, so you can choose to fold them on your knees, or stretch them to the middle of the thigh, or even the end of the thigh.
They should also be very flexible. Great elasticity make the thigh high socks to adapt to the diameter of the end of the thigh and the knee at the same time. There is a very large difference between the diameter of the knee and the end of the thigh. Thigh socks that can meet the end of the thigh usually do not stay under the knee, they will slip down easily.
Almost all Kayhoma thigh high socks are very long, their length is between 27-29 inches, they will easily cover the middle of the thigh, even if you are 6 feet tall. At the top of the socks, there is a wider band, and contains more than 12 super stretch threads. They can help thigh high socks adapt to the end of the thigh or the height of the knee at the same time. The wider band ensures that they will not slide down from knee to thigh. You can decide the height of the socks yourself to facilitate the matching of different skirts and boots.